Characterization of Ru-Fe/ZrO_2 Catalyst for Hydrogenation of Benzene to Cyclohexene

The Ru-Fe /ZrO2catalyst was prepared by the precipitation method and characterized by means of Xray photoelectron spectroscopy( XPS),Brunauer-Emmett-Teller specific surfacearea( BET),H2 temperatureprogrammed reduction(H2-TPR) and H2temperature-programmed desorption(H2-TPD). The results show that ruthenium exists in elemental state on the catalyst surface and a large part of the Fe are presented in the form of Fe2O3. It is found that the average pore diameter of the catalyst increases and the surface area decreases when the suitable Fe content is introduced,which is beneficial to the adsorption of hydrogenation and the desorption of cyclohexene and can improve the selectivity of cyclohexene. In liquid phase benzene hydrogenation,Ru-Fe /ZrO2catalyst exhibites higher cyclohexene selectivity. The selectivity for cyclohexene reaches 55. 87% and benzene conversion is 75. 64% at 20 min.